參數(shù)資料
型號(hào)： LTC4110EUHF#TR
廠商： LINEAR TECHNOLOGY CORP
元件分類： 電源管理
英文描述： 1-CHANNEL POWER SUPPLY SUPPORT CKT, PQCC38
封裝： 5 X 7 MM, 0.75 MM HEIGHT, PLASTIC, MO-220WHKD, QFN-38
文件頁(yè)數(shù)： 42/52頁(yè)
文件大?。?/td> 450K
代理商： LTC4110EUHF#TR
LTC4110
47
4110fb
PCB LAYOUT CONSIDERATIONS
For maximum efciency, the switch node rise and fall
times should be minimized. To prevent magnetic and
electrical eld (EMI) radiation and high frequency resonant
problems, proper layout of the components connected to
the IC is essential.
Flyback Layout
Lowest EMI and maximum efciency are obtained when the
high frequency switching current loop area is minimized.
It is best to make direct connections, avoiding the use of
other circuit board copper planes, i.e. no vias, in making
the following connections for this prevents current based
noise injection into the copper planes below.
1. Input/output capacitors positive terminals need to
be placed as close as possible between the yback
transformer “top” or positive supply rail connections
and RSNS(FET) ground connection.
2. Place yback MOSFETs drain connections right next
to the yback transformers “bottom” connections.
3. Place the RSNS(FET) current sense resistor right next
to the N-MOSFET source connections completing
the connection back to the input/output capacitors’
negative terminals.
4. Place the snubber connections as close as possible
to the circuit after the above layout connections are
completed as required. Again, avoid using vias.
5. The layer below the yback layout should be ground.
Other Recommendations
6. Optionally use vias to connect power supply sources
positive and negative (ground) connections from
other copper layers to the yback layout. Place
multiple vias in a tight cluster such that they act as
one large via. Recommended 1 via for each 0.5A of
current
7. The current sense feedback traces must be routed
together as a single pair on the same layer at any
given time with smallest trace spacing possible.
Locate any lter component on these traces next to
the IC and not at the sense resistor location.
8. The control IC must be close to the switching FET’s
gate terminals. Keep the gate drive signals short for
a clean FET drive. This includes IC supply pins that
connect to the switching FET source pins. The IC can
be placed on the opposite side of the PCB relative to
yback layout above.
9. Figure 21 shows an inexpensive way to achieve
Kelvin like sensing using standard current sense
resistors.
APPLICATIONS INFORMATION
TO CSP AND CSN
4110 F21
DIRECTION OF CHARGING CURRENT
RSNS(BAT)
Figure 21. Kelvin Sensing of Battery Current
相關(guān)PDF資料
PDF描述
LTC4110EUHF 1-CHANNEL POWER SUPPLY SUPPORT CKT, PQCC38
LTC4151CS-2#TRPBF 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO16
LTC4151HMS#TRPBF 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO10
LTC4151HDD#TRPBF 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO10
LTC4151HDD#PBF 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO10
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